The only issue I had was with the shower - the bathroom/shower combo was a very tiny room, and there was no door on the shower, just a curtain. Water would get into the bathroom a little bit, but there were plenty of towels. The problem was the first time I showered, I left the bathroom door open as there is no ventilation fan. I like hot showers, and the steam set off the smoke detector, at 6 am on a Saturday. I felt terrible and it took forever for the room to clear out enough that it would stop going off. Since then, I tried to take less hot showers and keep the bathroom door closed and windows open, and didn't have a problem, but the entire bathroom was quite steamy and wet after each shower. Also bring your own washcloth or shower loofah, as wash cloths were not provided. I would still stay here again, just a tip for those who may stay here to avoid ear piercing/very sensitive smoke detectors.
For the price I paid for a Union Square hotel, I was extremely pleased. SF rooms are normally smaller, but I had plenty of room for my luggage and my bicycle. The location was great, as a solo female I felt fine, and having the diner below and a discount coupon for hotel guests was very convenient and I ate there most days. The room was cozy, clean, and they actually put a little more thought into the decor vs. the standard budget hotel room. Earplugs were provided as was a bottle of water every day, which was a nice touch. I actually brought my own earplugs, but didn't need them. I live downtown Chicago and noise doesn't bother me, and I frankly didn't think the noise was even that bad, even on weekend nights. I would stay here again, no question.